为确定竹条加筋砂土的筋土界面工作机理，进行了大尺寸直剪试验。将厚度为5 mm的竹材分别制成长度为20，40，60 mm，宽度为10 mm的竹条，并分别按0.2%，0.4%，0.6%，0.8%，1.0%，1.2%的质量百分含量加入到砂土中，对加入竹条的砂土进行大尺寸直剪试验研究。结果表明:与纯砂相比，竹条加筋土的抗剪强度明显增强，峰值强度和残余强度均有所提高;竹条加筋土的黏聚力和内摩擦角均有所增加，其中黏聚力变化较大，内摩擦角变化较小;竹条加筋土的峰值抗剪强度随着竹条尺寸和竹条加筋率的增加呈现先增加后减小的规律;尺寸为10 mm×40 mm且质量百分含量为0.8%的竹条加筋砂土效果最佳。
Abstract
Bamboo slats (thickness of 5mm, width of 10mm, and length of 20, 40, 60mm respectively) were added into soil in different mass percentage contents (0.2%, 0.4%, 0.6%, 0.8%, 1.0%, and 1.2%). Then large-scale direct shear test was carried out on the soils reinforced with the bamboo slats to investigate the reinforcement mechanism. Results reveal that compared with pure sand, the shear strength of reinforced soil is obviously improved, the peak strength and residual strength are increased; and also cohesion and friction angle have increased, among which cohesion increased greatly; the peak shear strength of reinforced soil increased firstly and then decreased with the increasing size and percentage of bamboo slats; the optimal size of bamboo slat is 10mm×40mm and the optimal ratio of reinforcement is 0.8%.
关键词
竹条加筋土 /
大尺寸直剪试验 /
强度特性 /
黏聚力 /
加筋率
Key words
soil reinforced with bamboo slats /
large-scale direct shear test /
strength performance /
cohesion /
reinforcement ratio
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] CHEN Hong, CHENG Hai-tao. Tensile Properties of Bamboo in Different Sizes. Journal of Wood Science, 2015, 61(12): 552-561.
张 丹,王 戈,张文福,等.毛竹圆竹力学性能的研究.中南林业科技大学学报,2012, 32(7): 119-123.
李 旭. 楠竹力学性能试验研究及分析.长沙:湖南大学,2011.
GB/T 15780—1995,竹材物理力学性质试验方法.北京:中国标准出版社,1995.
BERGADO D T, BUKKANASUTA A. Laboratory Pull-out Tests Using Bamboo and Polymer Geogrids Including a Case Study. Geotextiles and Geomembranes, 1987, 5(3): 153-189.
MA’RUF M F. Shear Strength of Apus Bamboo Root Reinforced Soil. Ecological Engineering, 2012, 41(4): 84-86.
陈 俊.竹子作为土木工程加筋材料的现状研究.人民珠江,2015,28(3):99-102.
党发宁,刘海伟,王学武.竹子作为抗拉筋材加固软土路基的应用研究.岩土工程学报,2013,35(增2):44-48.
TOH C T, CHEE S K, LEE C H. Geotextile-bamboo Fascine Mattress for Filling over Very Soft Soils in Malaysia. Geotextiles and Geomembranes, 1994, 13(6):357-369.
HE Huang, JIN Shao-hong. Study on Strength Characteristics of Reinforced Soil by Cement and Bamboo Chips. Applied Mechanics and Materials, 2011, 71(8):1250-1254.
王 蕾,符文熹,郜进良,等. 用竹筋格栅加固公路软基 . 地下空间与工程学报,2014,10(增2):1899-1903.
石振明,吴廷臻,李建可. 竹筋在软土地基加固中的应用研究.工程地质学报,2011,19(增):483-491.
文 华,邹娇丽,雷 挺. 乡村公路竹筋加筋土路基施工工艺研究.施工技术,2015,44(15):114-117.
张世贤,张建经,黄双华.竹筋加筋土挡墙的力学性能研究.四川建筑科学研究,2013,39(6):155-156.
JIAN Zhang, ZHAI Jian-feng. Instrumented Full Scale Test and Numerical Analysis to Investigate Performance of Bamboo Pile-mattress System as Soil Reinforcement for Coastal Embankment on Soft Clay. Applied Mechanics and Materials, 2014, 501(10): 2132-2317.
王晓东,张虎元,吕擎峰.楠竹加筋复合锚杆管材力学性质试验研究.岩石力学与工程学报,2009,28(增1):2941-2946.
张玲玲,文 华,张志伟. 钻前工程竹筋加筋土工程特性试验研究.岩石力学与工程学报,2014,33(增2):3829-3833.
喻泽红,魏红卫,邹银生.加筋红砂岩风化土强度和变形特性.岩石力学与工程学报,2005,24(15):2770-2779.
包承纲,汪明远,丁金华. 格栅加筋土工作机理的试验研究.raybet体育在线
院报, 2013,30(1):34-41.
包承纲, 丁金华,汪明远. 极限平衡理论在加筋土结构设计中应用的评述. raybet体育在线
院报, 2013,31(3):1-10.
张艳美,张旭东,张鸿儒. 土工合成纤维土补强机理试验研究及工程应用. 岩土力学,2005,26(8):1323-1326.
基金
国家自然科学基金项目(51678223,51678224);湖北省高等学校优秀中青年科技创新团队计划项目(T201605);湖北工业大学高层次人才计划项目(YXQN2017001,BSQD12153)
PDF(2575 KB)
